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Capillary condensation between nonparallel walls.

Alexandr Malijevský1, Jiří Janek2

  • 1Research Group of Molecular Modelling, The Czech Academy of Sciences, Institute of Chemical Process Fundamentals, 165 02 Prague, Czech Republic and Department of Physical Chemistry, University of Chemical Technology Prague, 166 28 Prague, Czech Republic.

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Summary
This summary is machine-generated.

This study reveals two condensation types in confined fluids: single and double pinning. A phase diagram shows a reentrant phenomenon where condensation type changes with wall inclination.

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Area of Science:

  • Physics
  • Physical Chemistry
  • Materials Science

Background:

  • Fluid behavior in confined geometries is crucial for understanding phenomena from industrial processes to biological systems.
  • Capillary condensation, the formation of liquid in small pores or gaps, is influenced by surface geometry and fluid properties.
  • Nonparallel confinement introduces unique interfacial effects not observed in parallel systems.

Purpose of the Study:

  • To investigate the distinct types of capillary condensation in fluids confined between nonparallel plates of finite height.
  • To characterize these condensation phenomena, termed single and double pinning, based on edge contact angles.
  • To establish the conditions governing each condensation type and explore the system's phase behavior.

Main Methods:

  • Formulation of a Kelvin-like equation applicable to both single and double pinning condensation.
  • Construction of a global phase diagram to map condensation regimes.
  • Analysis of asymptotic properties and the nature of transitions between condensation states.

Main Results:

  • Identification of two condensation regimes: single-pinning and double-pinning, distinguished by edge contact angles.
  • Development of a phase diagram exhibiting a reentrant phenomenon where condensation type shifts with wall inclination.
  • Demonstration that the transition between single- and double-pinned states is continuous and depends on wall wetting properties.

Conclusions:

  • The study provides a comprehensive understanding of capillary condensation in nonparallel confinement.
  • The findings reveal a complex phase behavior, including reentrancy, influenced by geometric and surface properties.
  • The work offers insights into interfacial phenomena relevant to diverse scientific and engineering applications.